AirHint found the following cheapest return flights from Lisbon (LIS) to Oslo (OSL) in September 2025 (see full year).

Return flights

18 Sep - 23 Sep	Ryanair
03 Sep - 07 Sep	Norwegian
24 Sep - 01 Oct	easyJet
03 Sep - 10 Sep	Norwegian
23 Sep - 08 Oct	easyJet
18 Sep - 21 Sep	Ryanair
06 Sep - 13 Sep	Norwegian
12 Sep - 22 Sep	Ryanair
03 Sep - 13 Sep	Norwegian
20 Sep - 22 Sep	Vueling Airlines
25 Sep - 30 Sep	easyJet
26 Sep - 29 Sep	easyJet
25 Sep - 02 Oct	easyJet
27 Sep - 05 Oct	Ryanair
27 Sep - 11 Oct	Norwegian
17 Sep - 06 Oct	Norwegian
20 Sep - 04 Oct	TAP
27 Sep - 08 Oct	Norwegian
27 Sep - 13 Oct	Norwegian
27 Sep - 15 Oct	Norwegian

Also check the deals for one-way flights from Lisbon to Oslo in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Lisbon to Oslo in September from 151€

Return flights